/*!	 layeractivate.cpp
**	 Template File
**
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**	Copyright (c) 2008 Chris Moore
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#include <synfig/general.h>

#include "layeractivate.h"
#include <synfigapp/canvasinterface.h>

#include <synfigapp/localization.h>

#endif

using namespace std;
using namespace etl;
using namespace synfig;
using namespace synfigapp;
using namespace Action;

ACTION_INIT_NO_GET_LOCAL_NAME(Action::LayerActivate);
ACTION_SET_NAME(Action::LayerActivate, "LayerActivate");
ACTION_SET_LOCAL_NAME(Action::LayerActivate, N_("Activate Layer"));
ACTION_SET_TASK(Action::LayerActivate, "activate");
ACTION_SET_CATEGORY(Action::LayerActivate, Action::CATEGORY_LAYER);
ACTION_SET_PRIORITY(Action::LayerActivate, 0);
ACTION_SET_VERSION(Action::LayerActivate, "0.0");
ACTION_SET_CVS_ID(Action::LayerActivate, "$Id$");

Action::LayerActivate::LayerActivate():
    old_status(),
    new_status()
{ }

synfig::String
Action::LayerActivate::get_local_name()const
{
    if (!layer) {
        return _("Activate Layer");
    }

    return strprintf("%s '%s'",
                     new_status
                     ? _("Activate Layer")
                     : _("Deactivate Layer"),
                     layer->get_non_empty_description().c_str());
}

Action::ParamVocab
Action::LayerActivate::get_param_vocab()
{
    ParamVocab ret(Action::CanvasSpecific::get_param_vocab());

    ret.push_back(ParamDesc("layer", Param::TYPE_LAYER)
                  .set_local_name(_("Layer"))
                 );

    ret.push_back(ParamDesc("new_status", Param::TYPE_BOOL)
                  .set_local_name(_("New Status"))
                  .set_desc(_("The new status of the layer"))
                 );

    return ret;
}

bool
Action::LayerActivate::is_candidate(const ParamList &x)
{
    return candidate_check(get_param_vocab(), x);
}

bool
Action::LayerActivate::set_param(const synfig::String& name, const Action::Param &param)
{
    if (name == "layer" && param.get_type() == Param::TYPE_LAYER) {
        layer = param.get_layer();

        return true;
    }

    if (name == "new_status" && param.get_type() == Param::TYPE_BOOL) {
        new_status = param.get_bool();

        return true;
    }

    return Action::CanvasSpecific::set_param(name, param);
}

bool
Action::LayerActivate::is_ready()const
{
    if (!layer) {
        return false;
    }

    return Action::CanvasSpecific::is_ready();
}

void
Action::LayerActivate::perform()
{
    Canvas::Handle subcanvas(layer->get_canvas());

    // Find the iterator for the layer
    Canvas::iterator iter = find(subcanvas->begin(), subcanvas->end(), layer);

    // If we couldn't find the layer in the canvas, then bail
    if (*iter != layer) {
        throw Error(_("This layer doesn't exist anymore."));
    }

    // If the subcanvas isn't the same as the canvas,
    // then it had better be an inline canvas. If not,
    // bail
    //	throw Error(_("This layer doesn't belong to this composition"));

    old_status = layer->active();

    // If we are changing the status to what it already is,
    // the go ahead and return
    if (new_status == old_status) {
        set_dirty(false);
        return;
    } else {
        set_dirty();
    }

    if (new_status) {
        layer->enable();
    } else {
        layer->disable();
    }

    if (get_canvas_interface()) {
        get_canvas_interface()->signal_layer_status_changed()(layer, new_status);
    } else {
        synfig::warning("CanvasInterface not set on action");
    }
}

void
Action::LayerActivate::undo()
{
    // If we are changing the status to what it already is,
    // the go ahead and return
    if (new_status == old_status) {
        set_dirty(false);
        return;
    } else {
        set_dirty();
    }

    // restore the old status
    if (old_status) {
        layer->enable();
    } else {
        layer->disable();
    }

    if (get_canvas_interface()) {
        get_canvas_interface()->signal_layer_status_changed()(layer, old_status);
    } else {
        synfig::warning("CanvasInterface not set on action");
    }
}